Improvement in sheet-metal elbows



H. S. HUELLER.

Sheet-Metal Elbows.

No. 133,989, Patented De :.17,1872.

UNITED STATES PATENT ()rrxcn.

. HENRY S. HOELLER, OF CINCINNATI, OHIO, ASSIGNOR TO HIMSELF AND CHARLESHOELLER, OF SAME PLACE.

IMPROVEMENT IN SHEET-METAL ELBOWS.

Specification forming part of Letters Patent No. 133,989, dated December17, 1872.

. To an whom it may concern:

Be it known that I, HENRY S. HOELLER, of

V Cincinnati, Hamilton county, State of Ohio,

have invented a certain new and useful Improvement in Sheet-MetalElbows, of which thefollowing is a specification:

Nature and Objects of Invention. My invention is an improvement upon thesheet-metal elbow for which Letters Patent No. 128,146 were granted tomyself and Charles Hoeller, June 18, 1872 5 and consists in such aformation of the crimps that the iron is trebly folded, making a doublecrimp at each closing up of the iron, so that each crimp has fourthicknesses of iron; the object being to make portions of the machinefor making the elbow to show the manner of producing the double crimp.

General Description. The machine for making this improved form 1 ofelbow may be constructed in all its parts similar to the machine forwhich Letters Patj ent' were granted to Charles and Henry S.

Hoeller, March 28, 1871, except the devices ior producing thepreliminary crimp. These devices I prefer to make as follows: A is abeach extending around the head B of the mandrel for a distance equal tothe required length of crimp. The swinging clamps C C are grooved at cina manner corresponding with the bead B, so that when the tube of sheetmetal D is compressed between the clamps C C and the beaded head. B A apreliminary crimp is produced in the metal, as

- clearly shown in Fig. 3. In the construction of the bead and groovethe crown of the bead is grooved, as shown, and the bottom of the grooveis beaded, so that the metal is creased in five places, two for thebases of the crimp and three for the folds, to produce the double crimp.

When the tube is moved along so as to bring the preliminary crimpbetween the clamps C C and the clamps E E, which operat-e in a mannersubstantially as described in the Letters Patent of C. and H. S.Hoeller, of March 28, 1871, the preliminary crimp is forced into thefolded crimp shown at d in such a way that four thicknesses of metal arelaid together in each crimp, as shown in Figs. 2 and 3. In this way moremetal is taken up at each crimp than is possible with a crimp with adouble thickness of metal having the same projection. For this reasonthe present improvement is adapted for the construction of elbows withshorter bends, or with less number of crimps for the same curvature, orless projection of crimp with the same curvature and same number ofcrimps.

The machine for making these elbows may be so constructed that thecrimps upon the inner circle of the elbow will touch each other, ornearly so, and the elbow may be made from one tubular piece of metal ortwo half-tubes.

If made-of two pieces, seams will be made upon both the inner and outerarcs. It made of one piece, the seam is preferably upon the inner arc.

'Olaim.

A sheet-metal crimped elbow, made in one or more pieces, in which theprojecting crimps or ridges are made by closing together fourthicknesses of metal, substantially in the manner and for the purposespecified.

In testimony of which invention I hereunto set my hand.

- HENRY S. HOELLER.

Witnesses:

FRANK MILLWARD, J. L. WARTMANN.

